LASIK was 4 months ago - experiencing blurry vision, feel like something is in my eye. What is happening to me?

Believe it or not, this is not uncommon.  And, I would say that in 9 cases out of 10 (or more), patients experience this sensation due to dryness.  Try some good quality drops- perhaps a refresh Optive, or Systane maybe every couple of hours for a week or so. Keep in mind the environment and your screen time, and many other factors can increase the dryness of your eyes.